Improvement in valves for steam-engines



UNITED STATES PATENT QEEIcE JOHN D. BowN, OE JAMEsEUEG, AssieNoE To EIMsELE, DANIEL sNow HILL, OE srOTTswooD, AND ORLANDO PEEEINE, oE-soUTH AMEOY,

NEW JERSEY.

IMPROVEMENT IN VALVES FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 147,736, dated February 17, 1874; application filed August 13, 1873.

To all whom it may concern:

Be it known that I, JOHN D. BowN, of Jamesburg, in the county of Middlesex and State of New Jersey, have invented an Improved Valve for Steam-Engines, of which the following is a specication:`

This invention is intended as an improvement on the invention for which Letters Patent No. 121,677 were granted to D. Snowhill and J D. Bown, December 5,1871. The object of this invention is to prevent the steam from pressing on the valve, and causing it to grind or wear on its seat, and to balance it so that it may be the easier moved. The present invention consists in the combination of the valve, which has a steam-passage extending through it, with the steam-chest having live ports,two for receiving the steam, two for conducting the steam into the cylinder, and one exhaustport, all the parts being so arranged that the `steam-passage through the valve can only connect at a time with one of the admissionports to the chest, the valve meanwhile keeping the other steam-admission port leading to the chest closed, all as hereinafter more fully described.

The valve is made with a single steam-passage extending through it from side to side, and so arranged with reference to the steampassages formed by or through the shield that the steam must, before reaching either of the cylinder-ports, pass through such passage in the valve.

In the accompanying drawing, Figure l is a vertical longitudinal central section of a steam-cylinder, which is provided with my improved steam-chest and oscillating valve. Fig. 2 is a vertical transverse central section of said steam-cylinder.

Similar letters of reference indicate corresponding parts in both gures.

The letter A represents a steam-cylinder supporting the steam-chest C, and connected therewith by ports c and b in the usual manner. The steam-ehest G is of such size and shape as to be adapted for the reception of an oscillating valve, D, which valve is, by preferof the said ports a b with'the exhaust-passage f. Above the valve is formed or securely fastened, in the chest C, an arched crown or cap,

or nearly semi-annular shield, E, which covers the upper part of the valve, and prevents the steam in the chest from pressing on the top of the valve and from obstructing the movements thereof, and causing the more rapid wear. By means of this crown E, which does not quite extendto the bottom of the steam-chest, two steam-passages, g and h, are formed, which lead toward the opposite sides of the valve, as shown in Fig. ll. Steam enters the upper part of the chest through a pipe, i, and is thence conducted through one of the twochambers to one of the ends of the steam-passage d of the valve, said passage conducting such steam to the port a or b, with which it may be connected. If the valve is in the position shown in Fig. l, steam will enter the port a and exhaust through the port b, and after the piston has by such position of the parts been moved toward the port b the valve will, by the link mechanism with which it is connected, be oscillated so as to bring that end of its passage d which was in connection with the steam-passage h into connection with the port b, while the other end of the steam-passage d, that was joined tothe port c, will be raised into connection with the steampassage g, and thereupon steam will be admitted to the port b and eXhanst through port a. By means of the cap or crown E it is quite plain the valve is properly balanced, and will not wear on its lower surface, nor will it be hindered in requisite motion, and by having the single V-shaped, or, if desired, curved steam-passage d, which may even be straight through the valve D, the simultaneous entrance of the steam into both ends of such passage is prevented, and an easy and certain the passage al can only Connect with one of motion of the parts in the requisite manner the ports g hat a t1me,meanwh11e the valve secured. keeping the other closed7 substantially as set WVhat I claim as my invention isforth. The combination of the valve D, having JOHN D. BOWN. the steam-passage d extending through it, YVitneSSes: with the steam-chest c containing the stealn- F. V. BRIESEN,

ports g, h, a, b, and f, all arranged so that MICHAEL RYAN. 

